atrial
adjective anatomy specialized uk/ˈeɪ.tri.əl/ us/ˈeɪ.tri.əl/
（心脏）前房的
relating to or happening in an atrium of the heart
Premature beats that occur in the atria are called premature atrial contractions. 出现在前房的期外搏动被称为早发性心房收缩。
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